Oil burner for cooking range



y 1961 A. G. SAMOTHRAKIS 2,982,348

OIL BURNER FOR COOKING RANGE Filed May 15, 1957 IN V EN TOR. ANTONIOS e. SAMOTHRAKIS,

United States Pa This invention relates to the art of oil burners and particularly concerns a device useful in a cooking range for producing a flame for cooking purposes.

According to the invention there is provided a pipe which delivers a cylindrical envelope of airaround a fuel atomizing tip. The fuel in the form of heavy oil such as diesel fuel oil is delivered near the base of a conical chamber-where it is entrained by the air flow. The expanding mixture of air and oil is consumed by combustion in a cooking range where the device is mounted. Valve means are provided for controlling the rate of fiow of the air and oil. In the invention the air is delivered to the conical chamber in a whirling cylindrical envelope while the fuel is delivered into the envelope in a stream which is whirling in a direction opposite to the air flow. This creates a turbulence which insures more efiective mixing of the oil and air. The conical chamber can be formed with a cross section varying from circular to elliptical, and can be adjustably rotated with respect to the axis of the device.

In the invention there is'provided a device which can be used in a marine type of cooking range WilhOlltI'E- quiring auxiliary motors and pumps such as have been used heretofore. The device is so arranged that it may be supplied with fuel directly from the tanks in which is stored the oil for the ships engines, and the air or steam which is mixed with the oil in the combustion chamber can be supplied from ships boilers, superheaters,

air or steam of the ship.

It is, therefore, a principal object of the invention to provide a burner for a cooking range adapted to consume a mixture of heavy oil and air or steam.

It is a further object to provide a burner wherein an envelope of air or steam encloses a stream of heavy oil discharged into the center of the envelope near the apex of a conical combustion chamber.

It is a further object to provide a burner having an elliptical combustion chamber which is adjustably carried on the burner body for producing a. generally flat flame which can be varied in direction.

A further object is to provide a burner of the character described wherein the streams of air or steam and of oil respectively whirl in opposite directions to insure more efiective mixing of the several components of the burning mixture.

For further comprehension of the invention, and of the objects and advantages thereof, reference will be had to the following description and accompanying drawings, and to the appended claims in which the various novel features of the invention are more particularly set forth.

In the accompanying drawings forming a material part of this disclosure:

Fig. 1 is an elevational view of a portion of a marine cooking range embodying the invention.

Fig. 2 is a longitudinal sectional view on an enlarged scale of the burner according to the invention.

Fig. 3 is an end view of the burner.

- on this portion for mounting the'burner in wall 15. The.

oil to the individual burners.

" Patented May 2, 1961 In Fig. 1 is shown a cooking range 10 having front doors 12, 14 disposed beneath front panel or wall 15 of the range. Within the range is a wall 16 dividing the interior of the range or stove into compartments. A flue 17 is connected to each compartment as a means of disposing of exhaust, gases which are the products of combustion of fuel in the compartments. Burners20 extend into the respective compartments through apertures in wall 15. The structure of the burners is shown in Figs.

2 and 3. A fuel oil pipe 21 supplies heavy diesel type This oil can be delivered under pressure from a suitable oil storage tank. Another pipe 22' is connected between each burner and a main pipe 22, and delivers air or steam under pressure to the burners.

Referring now to Figs; 2 and 3,.there is shown a hollow? cylindrical or tubular pipe member 25 having an enlarged head 26 at one end. This head has a hollow conical chamber 27 communicating with the, cylindrical bore 28' in the tubularmember. A portion 29 :of the outer side of the tubular member is threaded and nuts 30, 32 are threaded tubular member has a turned down portion .33 through which extends a lateral bore 34 to'communicate with bore 28'. A nipple 35 is threaded in bore 34 and a valve sleeve 36 is threaded on nipple 35. Valve member 37 is rotatably disposed in a transverse aperture in sleeve 36. A nut 38 is threaded on nipple 35 to secure the nipple in bore 34. The air or steam pipe branch 22' is.

threaded in sleeve 36. Valve 37 has a handle 39 by which the flow of air or steam into the burner can be controlled. The bore 28' provides a passage for the air into the chamber 27. A pipe 41 which is threaded in the outer apertured end of tubular member 25 extends through bore 28 to define a cylindrical passage between the inner wall of member 25 and the outer wall of' pipe 41 for the air flowing into the burner. Pipe 41 is air compressors, or other available source of compressed formed with a central bore 46.

Chamber 27 has a cross section which varies from circularat its inner narrow end to elliptical at its outer wide end. The bore 28' in tubular member 25 is formed with a helical groove. A Similar helical groove 64 is formed in the outer surface of pipe 41 so that the cylindrical passage between tubular member 25 and pipe 41 causes air or steam towhirl as it enters chamber 27. Bore 46 in pipe 41 has a helical groove or rifling which is coiled in an opposite direction from the groove 64 and the groove in bore 28'. Thus the fuel issuing from bore 46' twists or whirls'in a direction opposite to the movement of the air issuing from the bore 28'. These oppositely whirling and expanding streams of fuel and air mix in chamber 27.

Pipe 41 is secured in the end of member 25 by a nut 43. The inner end of bore 46 has an opening near the apex of the chamber 27. The inner end 45 of pipe 41 is tapered to converge to the opening at the tip of the pipe 41. Connected to the outer end of pipe 41 is a coupling fitting 48 to which is threaded a pipe in the form of a nipple 49 containing valve member 50. This valve member has a handle 52 for controlling the flow of fuel oil through the aligned bores in nipple 49, coupling 48, and.

pipe 41. Nipple 49 is connected to pipe 41 through which fuel oil is supplied to the burner. Valve members 37 and 50 are generally conical in shape and have transverse bores 53, 54 respectively therein. Pins 55, 56 extend through the projecting narrow ends of the valve members to secure them in their valve seats. A nut 57 secures nipple 49 in coupling 48.

In operation, when the valves 37 and 50 are open, air flows through the cylindrical passage between pipe 41 and member 25 and enters chamber 27 in the form of a cylindrical envelope around tip 45. The fuel flows through the bore 46' and emerges in a line stream frombore 46'. It is carried by" the an envelope in an expanding path so that the fuel stream is expanded into a mist. When this mist is ignited by a match flame a flat-flaring flame is formed in chamber 27-. Since theairor steam is appliedv under pressure the fuel is quite homogeneous. Thus a hot flame is provided in each compartment of the cooking range.

Passages with grooved or rifled walls as shown in the drawing are preferred to passages with smooth walls since a hotter flame is obtainable with grooved walls. The or steam and fuel can be provided at higher pres sure and at a higher rate. of flow. The mixing will be very' complete so that the combustible, mixture can burn completely to provide a very hot flame. D u e. to the.

elliptical form of cavity v 27 a flat flaring. flame will issue atthehe'ad of the burner.

' While I have illustrated and described the preferred embodiment of my invention, it is to be understoodthat l-do not 'limit myself to the p'reeise construction herein.disclosed. and that various changes and modifications may be made Within the scope of the inventionas defined in the appended claim.

Having thus. described my invention, what I claim as new, and desire to secure by United States Letters Patent 1s:

In a marine range having an oven compartment and a wall for said compartment, the combination comprising a fuel supply pipe, an air supply pipe, a burner con nected to the supply pipes, said burner comprising a first tubular member having an axial bore with a helical- 1y grooved wall, said memberhaving an enlarged hollow head at one end, saidhollow headbeing formed with a. conical chamber. tapering outwardly and elliptical" in cross. section, another tubular member having a helically grooved outer wall extending through said axial bore and terminating in a pointed tip in said chamber, said other tubular member having a central bore with a helically grooved wall opening into the chamber, said first tubular member having a lateral bore opening into said axial barmaid other tubu ar member ha ing an. external. diameter less than the internal diameter of the first tubular member and defining a cylindrical passage in said axial bore, a first pipe means connecting said air supply pipe with said lateral bore, and a second pipe means connecting said fuel supply pipe with said central bore, and valve means controlling the flow of air and fuel in said first and second pipe means respectively, the helical groove in the inner wall of the first tubular member and the helical groove in the outer wall of the other tubular member each being of equal pitch, coextensive in length, and coiled in one direction, and the helical groove in the inner wall of said other tubular member being coiled in an opposite direction, so that air and fuel entering said chamber swirl in opposite directions and are effectively mixed therein.

References Cited in the file-ofthis patent UNITED STATES PATENTS 744,220 Neu Nov. 17', 1903 760,729 Camp May 24, 1904 903,736 Lee Oct. 10, 1908 920,818' Breckenridge May 4, 1909 1,006,534 Clark Oct. 24, 1911 1,105,804 Lawton Aug. 4, 1914 1,143,792 Smith June 22, 1915 1,292,782 Horikawa et al. Jan. 28, 1919 1,315,765 Eckart Sept. 9, 1919 1,396,086 Anthony Nov. 8, 1921 1,484,693 Wegscheider Feb. 26, 1924 1,536,046 Anthony May 5, 1925 1,554,788 Corwin Sept. 22, 1925 1,658,784 Williams Feb. 7, 192.8 1,954,173 Histed Apr. 10, 1934 2,616,493 Winters Nov. 4, 1952 2,659,427 Bither Nov. 17, 1953 FOREIGN PATENTS 593,939' Germany Mar. 6, 1934 631,082 Great Britain Oct. 26, 1949 

